Java Memory Layout

[Arun_N]

How the variables and objects will be stored in java? can we use bit fields kind of concept in java? how to declare variables such that we can save memory?

[masijade]

Why? Do you have a specific problem?

[DarrylBurke]

can we use bit fields kind of concept in java?

java.util.BitSet

db

[Dark]

Objects and variables already take up very little space, and with the standard amount of ram found in computers is 4-6 gigs of ram I doubt you will ever hit that mark.

I don't really know why you need to save even more memory, unless maybe you're coding something major like an operating system or are coding into something very small.

[masijade]

Objects and variables already take up very little space,

Not necessarily, it depends on what type of monster objects you create yourself (design questions ignored).

and with the standard amount of ram found in computers is 4-6 gigs of ram I doubt you will ever hit that mark.

Leaving out my previous comment, that depends, I have hit that mark a number of times, and that without and glaring "design questions".

My opinion is, we should first find out why the OP wishes to know this. If it for simple academic purposes, then he should simply do some research, if he has a specific "case" then he should describe that so that he can be helped.

[Dark]

I'm curious as to what you made that took up 4-6 gigs of ram.

[masijade]

Financial risk simulations for a very large bank over a ten year, quarterly timeframe, taking transfer risks into account.

[Dark]

Ahh, well I don't think that would be run on an average computer.

[JosAH]

Financial risk simulations for a very large bank over a ten year, quarterly timeframe, taking transfer risks into account.

System.out.println((Math.rand() > 0.5)?"buy!":"sell!");

kind regards,

Jos ;-)

[masijade]

Is probably just as valid. ;-)

[JosAH]

Is probably just as valid. ;-)

Why do you think I posted it? ''serious" is my middle name especially after I read up on the bears and bulls and their silly dramatic interpretation of dual costs. I don't buy that crapola ;-)

kind regards,

Jos aka Self Fullfilling Prophesy

[Arun_N]

I just wanted to Know about granularity and Padding in Java.

[masijade]

Them, As already Said, Research.

[Arun_N]

can anyone one please give solution to my problem..........

[JosAH]

can anyone one please give solution to my problem..........

This is what the JVM specification (read it!) has to say about your problem

3.7 Representation of Objects

The Java virtual machine does not mandate any particular internal structure for objects

kind regards,

Jos